Steam-valve



(No Model.) T 3 Sheets-Sheet 1. K. KNOTT.

STEAM VALVE. No. 369,797. Patented Sept. 13, 1887..

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K. K-NOTT.

STEAM VALVE.

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K. KNOTT.

STEAM VALVE.

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KENNARD KNOTT, OF CHICAGO, ILLINOIS.

STEAM-VALVE.-

SPECIPICATION forming part of Letters Patent No. 369,797, datedSeptember13, 1887. Application filed September 20, 1886. Serial No. 213,977. (Nomodel.)

To aZZ whom it may concern.-

Be it known that I, KENNARD KNOTT, of Chicago, in the county of Cook andState of Illinois, have invented certain new and useful Improvements inSlide-Valves, of which the following is a description, reference beinghad to the accompanying drawings, in which Figure 1 is a plan View of acylinder and steam-chest to which my improved valve is applied. Fig. 2is a vertical sectional view of the steamchest, taken upon the line x00, Fig. l, viewed in the direction of the arrow there shown, theslide-valve and dead-plate being removed. Fig. 3 is an end View with thecylinder-head removed and the remainder partly broken away and partly insection.

' Fig. 4 is a side view of the steam-chest with its dead-plate and valveremoved and port-ions of the remainder broken away to show the locationof the steamways. Fig. 5 is a central sectional view of thecylinderandsteam-chest, taken upon the line 3 y, Fig. 3. Fig. 6 is alike sectional view in detail of the valve and steam-chest, showing thedead-plate in a reversed position from that in Fig. 5. Fig. 7 is alikeview to that shown in Fig. 6 of a modification of said invention,showing one means of obtaining a larger exhaust. Fig. 8 is a sectionalview upon the line z 2, Fig. 7, representing a face view of the valvewith a portion broken away to show the deadplate. Fig. 9 is a rear viewof the valve, and Fig. 10 shows a modified form of valve and dead-plate.

Like letters of reference indicate like parts in the different figures.

The object of my invention is to dispense with what is commonly known asthe linkmotion in steam-engines, and to provide a simpler, lessexpensive, and equally effective means for reversing the movement of theengine when desired. 1

To this end my invention consists in providing a double slide-valve witha double set of steam ways and ports and aremovable and reversible plateso arranged that by the movement of a suitable lever one set ofadmissionports may be opened and the other set closed, and vice versa,thereby permitting the steam to be introduced upon the other side of thecylinder at will, all of which is hereinafter more particularlydescribed, and definitely pointed out in the claims.

A in the drawings represents asteain-cylinder having a piston, A, Fig.5, and pistonrod a.

Bisasteanrchesthaving steam supply ports 0 C D D and exhaust-ports E E.ply-port O connects with a steam passage or way, C", Fig. 4, leading tothe opposite end of the steam-chest, where it emerges into an enlargedpassage, 0 with which theport 0 also connects. Said way 0 is connectedwith the cylinder behind the piston, preferably by passing around theend through a suitable offset or projection, A, as shown in Fig. 4 andindicated in dotted lines in Figs. 2 and 5.

The port-s D D unite in a common central passage, D Figs. 4, 5, and 6,which leads to the front of the steam-chest, and,like the way 0 passesaround the end through an offset, A into the front end of the cylinderA.

The exhaust-ports E E unite at one end in a common Way, E Figs. 3, 4,and 5, which, after passing partially around the cylinder, is connectedwith the exhaust-pipe E, Figs. 1 and 2.

From the foregoing it is obvious that if the ports O D be normallyclosed and the steam alternately admitted into the ports 0 D, andassuming that there be a proper exhaust, the piston must thereby bereciprocated. This would manifestly be the result if the ports G D wereclosed and the ports 0 D alternately opened.

To enable me to accomplish this result, I provide a loose or slidingplate, F, Figs. 5 and 6, designated by me as a dead-plate, which Iinsert between the ports described and the slide-valve, and which formsthe valvc-seat. Said dead-plate is provided with a series ofadmission-ports, 1, 2, 3, 4, 5, and 6, Figs. 5 and 6, said ports beingso arranged in the plate with reference to said ports 0 D E and G D Ethat when the ports 1 2 3 are opposite the ports C E D the ports D E Gare closed, and vice versa. Attached to one end of said plate F is arod, f, which is connected with a hand-lever, F, pivotally attached to abracket, F, the upper part of which is formed in a sector shape andprovided with notches The sup-' f for the reception of an ordinaryspringcatch, f By means of said lever the deadplate maybe moved ineither of the positions described, so that one set of ports may beclosed and the other set opened at will, the plate being retainedineither position by means of said catch. In connection'with saiddeadplate and double ports I employadouble slidevalve, which isconstructed and arranged as follows: G is the usual rod protrudingthrough the steam-chest, to which is rigidly attached, by means of aset-screw, a collar, 5/, Figs. 5 and 6, as well as a double steam-valve,the respective ends of which constitute distinct valves. (marked GGZ)constructed in theusual way, (except the steamway-connection between thetwo, hereinafter described,) the whole being preferably formed in onepiece provided with a separation or slot between them for the admissionof steam, the width of which slot corresponds to that of one of thesteam-ports D D.

Instead of making the offsets A A upon the respective ends of thecylinder, the steamways D C may be carried into the cylinder, as shownin Fig. 7, thereby leaving the cylinderheads in the usual form.

As it is important to provide ample means for exhausting the steam inorder to prevent undue compression, I have shown two ways ofaccomplishing that end--the first by making the ports E E longer thanthe others, as shown in Figs. 2 and 4, and, secondly, by enlarging thespaces 2 and 5, respectively, as shown in Fig. 7, so that a portion onlyof the plate of the width of the lap of the valve is left in each place,and forming steamways (l G in the valve itself, so that upon themovement of the valve the distance of the width of its lap the steamwill exhaust simultaneously into the ports E E, regardless of which setof receiving-p'orts be open.

I do not eonfine'myself to an oblong deadplate arranged to bereciprocated, as it is obvious that the same may be made round, if

desired, with avalve corresponding in shape, as shown in Fig. 10, inwhich case the valve may be caused to oscillate by connecting therewitha crank, g, and attaching the valve-rod G thereto, though I prefer theconstruction heretofore described. 1

The operation of said valve is as follows: When a forward movement ofthe engine is desired, the dead-plate should be placed in the positionshown in Fig. 5, in which event the piston is operated through themedium of the ports 0 D E. Upon moving said plate as described, theremaining set of ports are opened and the engine is caused to runbackward. In the former case the part G and in the latter the part G ofthe valve becomes operative. v

Having thus described my invention, I claim 1. The combination, with acylinder having double ports and steamways, of a movable dead-platearranged to alternately open one set and close the other set of ports,and a double slide-valve having steamways therein connecting the twoexhaust-chambers, whereby the compressed steam from the cylinder maysimultaneously escape from both exhaustports.

2. In combination with a cylinder having two sets of steam ports andways, a double valve having one or more steam ways or channelsconnecting the exhaust-chambers and ar-' ranged to operate alternatelywith either set of ports as the same may be open, respectively, and adead-plate having openings therein corresponding in number to saidports, the openings connecting with the exhaust-ports being so enlargedthat the exhaust-steam may escape through both at the same time,substantially as and for the purposes specified.

KENN A RD KNOTT.

Witnesses:

D. H. FLETCHER, J. B. HALPENNY.

